|Transitional instability of spherical shells under dynamic loadings - Ho, Fang-Huai|
Keywords: Buckling (Mechanics
|Analysis of error processes in computer software - Schneidewind, Norman F.|
Title from cover
Keywords: BUCKLING (MECHANICS); PROJECTILES
|Effect of initial displacement of the center support on the buckling of a column continuous over three supports - Langley Aeronautical Laboratory|
Keywords: Buckling (Mechanics; Aerodynamics--Research
|LPI : an interactive linear programming package - Shudde, Rex H.|
Title from cover
Keywords: BUCKLING (MECHANICS); PROJECTILES
|Tripping of stiffened plates using a refined beam theory - Danielson, D. A. (Donald A.).|
Technical report for period October 1987 - March 1988.
Keywords: STIFFENING; BUCKLING; BEAMS(STRUCTURAL)
|Simulation of Kalman filter used for long baseline underwater tracking - Washburn, Alan R.|
Title from cover
Keywords: BUCKLING (MECHANICS); PROJECTILES
|Analytical tripping loads for stiffened plates - Danielson, D. A. (Donald A.)|
Technical report for period October 1993 - December 1993.
Keywords: BUCKLING; AXIAL LOADS
|Thermal bending of sandwich panels under uniaxial loading - Bernstein, Edward Linde|
Keywords: Sandwich construction; Buckling (Mechanics)
|A Critical Review on Buckling and PostBuckling Analysis of Composite Structures|
Main buckling and post-buckling analysis methods for composite structures are presented, along with the discussion on their potential challenges in handling the accuracy of prediction. Common buckling and post-buckling behaviors of composite structures are described, and thecapabilities of corresponding analysis techniques are reviewed. Compared with the structures made of metals, the anisotropy of composite materials is one of the key difference which could be considered in constituti...
Keywords: Composite Structures; Buckling; Post-Buckling; Structural Analysis; Shell Structures; Anisotropy
|Charts showing relations among primary aerodynamic variables for helicopter-performance estimation - Talkin, Herbert|
In order to facilitate solutions of the general problem of helicopter selection, the aerodynamic performance of rotors is presented in the form of charts showing relations between primary design and performance variables. By the use of conventional helicopter theory, certain variables are plotted and other variables are considered fixed. Charts constructed in such a manner show typical results, trends, and limits of helicopter performance...
Keywords: STRESSED SKIN-STIFFENER COMBINATIONS - BUCKLING; BEAMS - FLANGES; COLUMNS - INSTABILITY; COLUMNS - BUCKLING & TORSION; PLATES, FLAT - BUCKLING; LOADS - COLUMN
|Buckling and steady flutter of heat-compressed panels in a supersonic flow - Bolotin, V. V.|
Buckling and steady flutter of heat compressed panels in supersonic flow
Keywords: BUCKLING; THERMAL BUCKLING; COMPRESSING; FLUTTER ANALYSIS; PANEL FLUTTER; SUPERSONIC FLOW; THERMAL BUCKLING; FLUTTER ANALYSIS; PANEL FLUTTER; SUPERSONIC FLOW
|BUCKLING DESIGN STUDIES OF INVERTED, OBLATE BULKHEADS FOR A PROPELLANT TANK - Stanley S. Smeltzer III|
Keywords: buckling design; design; oblate bulkheads; propellant tank
|Geometrically nonlinear analysis of shell structures using flat DKT shell elements - Batoz, Jean-Louis.;Cantin, Gilles.|
Progress report for period Jan 1984 - Sep 1984.
Keywords: STRESS STRAIN RELATIONS; BUCKLING; SHELLS(STRUCTURAL FORMS)
|Instability of cylindrical shells with inclined stiffeners - Lee, Ru-Lin|
Keywords: Cylinders; Strains and stresses; Buckling (Mechanics)
|Orthotropic cylindrical shells under dynamic loading - Mangrum, Elmer, 1936-|
Keywords: Cylinders; Buckling (Mechanics); Strains and stresses
|Geomagnetic Cutoff Rigidity Computer Program: Theory, Software Description and Example - Smart, D. F.|
The access of charged particles to the earth from space through the geomagnetic field has been of interest since the discovery of the cosmic radiation. The early cosmic ray measurements found that cosmic ray intensity was ordered by the magnetic latitude and the concept of cutoff rigidity was developed. The pioneering work of Stoermer resulted in the theory of particle motion in the geomagnetic field, but the fundamental mathematical equations developed have 'no solution in closed form'...
Keywords: ANISOTROPIC PLATES; ANISOTROPY; BUCKLING; LAMINATES; THERMAL EXPANSION
|Escalation provisions for Navy contracts issues and choices - Sovereign, Michael G.;Jones, Carl R.|
Title from cover
Keywords: ELASTIC PLATES AND SHELLS; BUCKLING (MECHANICS)
|7. Civil Post Bucking Akil Ahmed|
In this project work, a new consistent higher order theory has been developed for the buckling and post buckling analysis of sandwich beams having functionally graded faces. The model combines an approximation for the displacement fields with third order in the thickness direction. The governing equilibrium equations of motion and the related boundary conditions have been derived. The parametric study of the beam behaviors under different situations is performed and the important influencing par...
Keywords: Buckling; Post Buckling; Sandwich Beam; Shear Deformation Theory; Functionally Graded Faces
|A multimodulus elasticity theory - Ambartsumyan, S. A.|
Multimodulus elasticity theory applied to bodies resisting extension and compression
Keywords: BUCKLING; COMPRESSION LOADS; ELASTIC PROPERTIES; ISOTROPY; COMPRESSION BUCKLING; DYNAMIC MODULUS; ELASTICITY
|Effect of retractable-spoiler location on rolling- and yawing-moment coefficients - Shortal, J|
In this report are presented the results of wind-tunnel tests of retractable spoilers on the upper surface of a Clark Y wing, which have been made as part of an investigation of lateral control devices being conducted by the National Advisory Committee for Aeronautics. Spoilers with chords up to 15.0 percent of the wing chord were tested in several locations on a plain rectangular wing and in two locations on the same wing equipped with a 20.0 percent chord split flap down 60 degrees...
Keywords: TUBING, RECTANGULAR - STRESSES, COMPRESSIVE; STRESSED SKIN; CHARTS - STRESSES; THEORIES - BUCKLING -TIMOSHENKO; PLATES - BUCKLING
|Local instability of symmetrical rectangular tubes under axial compression - Lundquist, Eugene|
A chart is presented for the coefficient in the formula for the critical compressive stress at which cross sectional distortion begins in a thin-wall tube of rectangular section symmetrical about its two principal axes. The energy method of Timoshenko was used in the theoretical calculations required for the construction of the chart. The deflection equation used in this method was selected to give good accuracy...
Keywords: LOADS - WING PANELS; THEORIES - BUCKLING - TIMOSHENKO; THEORIES - BUCKLING - FRANKLAND; THEORIES - BUCKLING - MARGUERRE; THEORIES - BUCKLING - SOUTHWELL; FORMULAS - STRESSED SKIN - COX; FORMULAS - STRESSED SKIN - SECHLER; FORMULAS - BUCKLING - KARMAN; INSTR - STRAIN GAUGES - TUCKERMAN
|mit :: ai :: aim :: AITR-1590|
From the bitsavers.org collection, a scanned-in computer-related document.mit :: ai :: aim :: AITR-1590
Keywords: column; buckling; control; actuators; actuator; actuation; active; mode; applied; deflection; second buckling; restoring force; active control; feedback factor; buckling load; strain gages; compressive members; critical buckling; bending moments; buckling mode
|Axisymmetric buckling of annular sandwich panels - Amato, Amelio John, 1944-|
Keywords: Buckling (Mechanics); Sandwich construction; Elastic plates and shells
|RADAR OBSERVATIONS OF METEORS ACCORDING TO THE INTERNATIONAL GEOPHYSICAL YEAR PROGRAM - KASHCHEYEV, B. L|
AN APPARATUS USED IN THE INVESTIGATION OF METEOR ACTIVITY, WHICH EMPLOYS A SYSTEM OF PROTECTION AGAINST PULSE INTERFERENCE, IS DESCRIBED. PRELIMINARY RESULTS OF THE MEASUREMENT OF METEOR VELOCITIES OBTAINED BY RUSSIAN OBSERVATION STATIONS DURING THE FIRST 12 MONTHS OF THE INTERNATIONAL GEOPHYSICAL YEAR ARE PRESENTED, AND A STUDY OF THE PHYSICAL PROPERTIES OF THE ATMOSPHERE AT ALTITUDES OF 80 TO 100 KILOMETERS IS MADE.
Keywords: BUCKLING; STABILITY; MODELS; EXPERIMENTATION; ELASTIC BODIES; SPECKLE PATTERNS
|Vibratory stresses in propellers operating in the flow field of a wing-nacelle-fuselage combination - Rogallo, Vernon L|
No Abstract Available
Keywords: SANDWICH CONSTRUCTION; PLATES - BENDING, RECTANGULAR; PLATES - BUCKLING, RECTANGULAR
|Study of a Solar Sensor for use in Space Vehicle Orientation Control Systems - Spencer, Paul R|
The solar sensor described herein may be used for a variety of space operations requiring solar orientation. The use of silicon solar cells as the sensing elements provides the sensor with sufficient capability to withstand the hazards of a space environment. A method of arranging the cells in a sensor consists simply of mounting them at a large angle to the base. The use of an opaque shield placed between the cells and perpendicular to the base enhances the small-angle sensitivity while adding ...
Keywords: BUCKLING; SANDWICH STRUCTURES; COMPRESSIBILITY; CHARTS; COEFFICIENTS; LOADS (FORCES); TRUSSES
|3. Thickness Comparison.full|
In the present investigation Numerical Simulation of Analysis of Buckling of Stiffened Circular Plates Subjected to In-Plane Loading has been done. Circular plate of radius of 0.5m and thickness of 0.005m of the plate is held constant for all the cases that are studied. The boundary conditions considered are such that the plate is fixed and released in radial direction. Stiffened circular plates subjected to the above loads and boundary conditions are numerically simulated using ABAQUS 6.10 vers...
Keywords: Buckling Load; ABAQUS6.10; Stiffened Plate; Circular Plate
|On the automated optimal design of constrained structures - Hornbuckle, Jerry Clyde|
Keywords: Structural dynamics; Structural engineering; Girders; Buckling (Mechanics); Structural design
|SLEEP PATTERNS OF WORKERS ON ROTATING SHIFTS - FORET, J.|
WORKERS WHO WERE ON ROTATING SHIFTS FOR SEVERAL YEARS SERVED AS SUBJECTS FOR THE RECORDING OF THE EEG DURING NOCTURNAL AND DIURNAL SLEEP. IT WAS FOUND THAT THE DURATION OF SLEEP IS REDUCED WHEN IT MUST TAKE PLACE DURING THE DAYTIME, OR AT TIMES OTHER THAN USUAL SLEEP PERIODS. IT IS ALSO SHOWN THAT THE LATER THE SUBJECT GOES TO SLEEP, THE SHORTER IS THE DURATION OF DAYTIME SLEEP. THE AMOUNT OF DAYTIME PARADOXICAL SLEEP (PS) IS LESS THAN DURING THE NIGHT BUT THE AMOUNT OF SLOW WAVE SLEEP IS PRACTI...
Keywords: BUCKLING; RECTANGULAR PLATES; SHEAR STRESS; AIRCRAFT STRUCTURES; APPROXIMATION; LOADS (FORCES)
|4. Eng Design And Analysis Muruganatham - Krishna Prasanth K & Muruganantham P|
In launch vehicle structures design, importance is given to lightweight with high load bearing capacity design, so the factor of safety is kept low compared with ground-based structures and at the same time maintaining high reliability. This demands very accurate analysis of structural elements for launch vehicle. The main criteria are lightweight, ease of fabrication, lower cost and at the same time meeting the strength and stiffness requirements...
Keywords: Inter-Tank Structure; Isogrid; Integrally Stiffened; Buckling Analysis
|Buckling and deformation of heated conical shells - Chang, Lu-Kang|
Keywords: Elastic plates and shells; Buckling (Mechanics); Deformations (Mechanics); Thermal stresses
|Deck boxes for UHF SATCOM radio frequency interference study - Parker, Gary B.;Ohlson, John E.|
Thesis (M.S. in E.E.)--Naval Postgraduate School, 1976
Keywords: ELASTIC PLATES AND SHELLS; BUCKLING (MECHANICS); PROPELLANTS--COMPUTER PROGRAMS
|Exponential experiments on light water moderated 1 per cent U-235 lattices - Brookhaven National Laboratory|
Keywords: Light water reactors--Fuel--Testing; Uranium; Nuclear reactors--Buckling
|Measured moments of inertia of 32 airplanes - Gracey, Willia|
A compilation of the experimentally determined moments of inertia of 32 airplanes is presented. The measurements were obtained at the laboratories of the naca by means of a pendulum method. The airplanes tested are representative of several types of aircraft of gross weight less than 10,000 pounds. The results are presented in coefficient as well as in dimensional form. An elementary analysis of the data disclosed the possibility of grouping the results according to wing type of the airplane, as...
Keywords: STRESSED SKIN LMAL; CHARTS - STRESSES; THEORIES - BUCKLING - TIMOSHENKO; LOADS - COLUMNS; PLATES - BUCKLING; STRESSED SKIN - COLUMNS; TUBING, RECTANGULAR - STRESSES, COMPRESSIVE
|The prospects of the helicopter - Warner, Edward|
The advantages of helicopters are listed along with a discussion of safety devices, the problems of control, and the need for horizontal flight.
Keywords: PLATES - BUCKLING CURVED; PLATES, CURVED - STRENGTH, COMPRESSIVE; STRESSED SKIN - PLATES, CURVED; STRESSED SKIN - PLATES, RECTANGULAR; PLATES - BUCKLING RECTANGULAR
|The spot welding of Alclad 24S-T in thicknesses of 0.064, 0.081, and 0.102 inch - Hess, W F|
No Abstract Available
Keywords: STIFFENERS, ALUMINUM-ALLOY - ALCOA 24ST; Z-SHAPED; LOADS - COLUMNS; COLUMNS - BUCKLING; STRESSED SKIN-STIFFENER COMBINATIONS - BUCKLING; COLUMNS - STRENGTH, COMPRESSIVE; COLUMNS, ALUMINUM ALLOY - ALCOA 24ST; STRESSED SKIN-COLUMNS - BUCKLING
|A METHOD OF DISCUSSION OF THE ELASTIC STABILITY IN NON-LINEAR SNAP BUCKLING. SNAP BUCKLING OF CIRCULAR PLATES DUE TO RAPID HEATING OR COOLING - Uemura, M|
Elastic stability in nonlinear buckling of circular plates due to rapid heating or cooling
Keywords: BUCKLING; BUCKLING; CIRCULAR PLATE; COOLING; ELASTIC STABILITY; HEATING; NONLINEARITY; CIRCULAR PLATES; COOLING; DAMPING; DIFFERENTIAL EQUATIONS; EULER EQUATIONS OF MOTION; HEATING; NONLINEARITY; SNAP
|Effect of horizontal tail on low-speed static lateral stability characteristics of a model having 45 degree sweptback wing and tail surfaces - Brewer, Jack D|
No Abstract Available
Keywords: STRESSED SKIN - PLATES; PLATES - STRESSES, SHEARING CURVED; PLATES, FLAT - SHEAR RECTANGULAR; PLATES - BUCKLING CURVED; PLATES - BUCKLING RECTANGULAR; PLATES - COMPRESSION CURVED; PLATES - COMPRESSION RECTANGULAR
|Torsional stability of aluminum alloy seamless tubing - Moore, R L|
Torsion tests were made on 51ST aluminum-alloy seamless tubes having diameter-to-thickness ratios of from 77 to 139 and length-to-diameter ratios of from 1 to 60. The torsional strengths developed in the tubes which failed elastically (all tubes having lengths greater than 2 to 6 times the diameter) were in most cases within 10 percent of the value indicated by the theories of Donnel, Timoshenko, and Sturm, assuming a condition of simply supported ends.
Keywords: STRESSED SKIN LAMAL; COLUMNS, ALUMINUM-ALLOY - ALCOA 24ST - STRENGTH, COMPRESSIVE; LOADS - COLUMNS; CHARTS - STRESSES; THEORIES - BUCKLING - TIMOSHENKO; PLATES - BUCKLING; FORMULAS, COLUMN - EULER; ELASTICITY
|6. Civil IJCE Effect Of Patch Length Ratio Of In Plane Jawadtalibadodi|
The present study investigates the problem of post buckling of thin steel plates subjected to in-plane patch compression loading. Finite difference method was used to treat the stability problems. The geometrically nonlinearity was considered. The present procedure is general and applicable to the buckling, post buckling and free vibration of thin rectangular plates. The influences of initial imperfection, thickness variation, plate aspect ratios, boundary conditions, and length of patch loadi...
Keywords: Thin Plates; Tapered Plates; Large Displacement; Post Buckling Behavior; Patch Compression Loading; Finite Difference Method
|Bell-Curve Genetic Algorithm for Mixed Continuous and Discrete Optimization Problems - Kincaid, Rex K.|
In this manuscript we have examined an extension of BCB that encompasses a mix of continuous and quasi-discrete, as well as truly-discrete applications. FVe began by testing two refinements to the discrete version of BCB. The testing of midpoint versus fitness (Tables 1 and 2) proved inconclusive. The testing of discrete normal tails versus standard mutation showed was conclusive and demonstrated that the discrete normal tails are better...
Keywords: BUCKLING; CURVATURE; ANISOTROPIC PLATES; THERMAL EXPANSION; ELASTIC PROPERTIES; LAMINATES; LOADS (FORCES); CONTRACTION; MEMBRANE STRUCTURES; CRITICAL TEMPERATURE
|Innovation and reliability of atomic standards for PTTI applications - Kern, R|
Innovation and reliability in hyperfine frequency standards and clock systems are discussed. Hyperfine standards are defined as those precision frequency sources and clocks which use a hyperfine atomic transition for frequency control and which have realized significant commercial production and acceptance (cesium, hydrogen, and rubidium atoms). References to other systems such as thallium and ammonia are excluded since these atomic standards have not been commercially exploited in this country.
Keywords: EXPANSION; LAMINATES; METAL FATIGUE; METAL MATRIX COMPOSITES; THERMAL STRESSES; POWDER METALLURGY; TEMPERATURE EFFECTS; THERMAL BUCKLING
|NASA GRC Stirling Technology Development Overview - Thieme, Lanny G.|
The Department of Energy, Lockheed Martin (LM), Stirling Technology Company, and NASA Glenn Research Center (GRC) are developing a high-efficiency Stirling Radioisotope Generator (SRG) for potential NASA Space Science missions. The SRG is being developed for multimission use, including providing spacecraft onboard electric power for NASA deep space missions and power for unmanned Mars rovers. NASA GRC is conducting an in- house supporting technology project to assist in developing the Stirling c...
Keywords: AXIAL COMPRESSION LOADS; ANISOTROPIC PLATES; SHEAR PROPERTIES; DEFORMATION; BUCKLING; LAMINATES; COEFFICIENTS
|Concept for a Micro Autonomous Ultrasonic Instrument (MAUI) - Wilson, William C.|
We investigate a concept for the construction a mobile Micro Optical ElectroMechanical Systems (MOEMS) based laser ultrasonic instrument to serve as a Micro Autonomous Ultrasonic Instrument (MAUI). The system will consist of a laser ultrasonic instrument fabricated using Micro Electro-Mechanical Systems (MEMS) technology, and a MEMS based walking platform like those developed by Pister et al. at Berkeley...
Keywords: BOUNDARY CONDITIONS; BUCKLING; DEFORMATION; LAMINATES; PLATES (STRUCTURAL MEMBERS); NONLINEAR SYSTEMS; PLY ORIENTATION; DISPLACEMENT
|The First SeaWiFS HPLC Analysis Round-Robin Experiment (SeaHARRE-1) - Claustre, Herve|
Four laboratories, which had contributed to various aspects of SeaWiFS calibration and validation activities, participated in the first SeaWiFS HPLC Analysis Round-Robin Experiment (SeaHARRE-1): Horn Point Laboratory (USA), the Joint Research Centre (Italy), the Laboratoire de Physique et Chimie Marines (France), and the Marine and Coastal Management group (South Africa). The analyses of the data are presented in Chapter 1 and the individual methods of the four groups are presented in Chapters 2...
Keywords: BUCKLING; FINITE ELEMENT METHOD; MATHEMATICAL MODELS; NUMERICAL ANALYSIS; ESTIMATING; CRITICAL LOADING; COMPOSITE STRUCTURES; LOADS (FORCES); DEFECTS
|Use of Maps, GTE and UARS-MLS Data in Understanding Tropospheric Processes Critical to Model Development - Newell, Reginald E|
Two of the major problems in using meteorological models to explain observed tropospheric trace constituent distributions and thereby to understand the global budgets of the tracers are to properly define the vertical layered structure in the free atmosphere, and to understand the contribution of advection processes in generating horizontal inhomogeneities at all scales. We proposed to tackle these problems through the examination of an extensive collection of trace constituent data from researc...
Keywords: STABILITY; UNSTEADY STATE; BUCKLING; BENDING; COLLAPSE; BUBBLES; LIQUIDS; ELASTIC SHEETS; VISCOUS FLUIDS
|Defining Earth System Enterprise Information Needs and Pilot Programs for Utilization by Local Government in the Eastern US - Brower, Robert N|
This report profiles 13 objectives of the grant it covers, and summarizes significant findings or accomplishments.
Keywords: CERAMIC MATRIX COMPOSITES; STRESS ANALYSIS; STRUCTURAL ANALYSIS; STRUCTURAL FAILURE; FINITE ELEMENT METHOD; BUCKLING; SHEAR; PROBABILITY THEORY
|An Introduction to Markov Modeling: Concepts and Uses - Boyd, Mark A|
Kharkov modeling is a modeling technique that is widely useful for dependability analysis of complex fault tolerant systems. It is very flexible in the type of systems and system behavior it can model. It is not, however, the most appropriate modeling technique for every modeling situation. The first task in obtaining a reliability or availability estimate for a system is selecting which modeling technique is most appropriate to the situation at hand...
Keywords: COMPOSITE STRUCTURES; CYLINDRICAL SHELLS; VOIDS; COMPRESSION TESTS; FINITE ELEMENT METHOD; BUCKLING
|Characteristics of low-aspect ratio wings at supercritical Mach numbers - Stack, John|
No Abstract Available
Keywords: CYLINDERS, MONOCOQUE - BUCKLING; LOADS - CYLINDERS, MONOCOQUE; CYLINDERS, MONOCOQUE - BENDING; FUSELAGES, MONOCOQUE - STRENGTH
|Characterization of Side Load Phenomena Using Measurement of Fluid/Structure Interaction - Brown, Andrew M.|
During ground-tests of most production rocket engines over the last 30 years, large asymmetric transient side loads coming from the nozzle and related steady-state vibrational loads within the nozzle have been measured. The widely varying magnitude of these loads has been large enough to fail interfacing components as well as nozzles in these engines. This paper will discuss a comprehensive test and analysis program that has been undertaken to develop a methodology to accurately predict the char...
Keywords: BULKHEADS; BUCKLING; CYLINDRICAL SHELLS; PROPELLANT TANKS; STRUCTURAL ANALYSIS; COMPUTER PROGRAMS; CRITICAL LOADING; COMPOSITE STRUCTURES; STIFFENING